水稻对镉的吸收转运与耐性的关系研究

目的]明确了水稻品种耐Cd能力与体内分布的关系。方法]采用水培法对江苏地区10个水稻品种对镉(Cd)的吸收转运和耐性特点进行了比较。结果]不同水稻品种耐Cd能力和体内分布存在显著差异。特优559的地上部生长受Cd抑制最大,而镇稻8号没有受到Cd处理的影响。扬辐粳7号的地上与地下部Cd浓度比(S/R)最大,而K优818的S/R值最低。水稻的吸收转运和耐性之间没有直接的联系。按照水稻对Cd的耐性指数和冠根比进行聚类分析,可将10个品种分为4类:①Cd转运多且耐性弱(扬辐粳7号和特优559);②转运较少但耐性较弱(两优培九和苏优22);③转运少且耐性较强(Ⅱ优838、K优818和武运粳7号);④转运较多但耐性强(宁粳1号、镇稻8号和86优8)。结论]该研究为筛选同时具有低Cd含量和高Cd耐性特点的水稻品种提供依据。

Studies on the Relationship among Cadmium Absorption, Translocation and Tolerance in Rice

Objective] The research aimed to confirm the relationship between the tolerance of rice cultivars to cadmium(Cd) and its distribution in vivo.Method] The absorption,translocation and tolerance characteristics of 10 rice cultivars in Jiangsu province to Cd were compared by using solution culture method.Result] The tolerance and distribution in vivo had significant difference among different rice cultivars.The growth of the aboveground parts in Teyou 559 was greatly inhibited by Cd,but Zhendao 8 was not affected by Cd treatment.The ratio of Cd concn.in the aboveground oart and underground part of Yangfujing 7 was highest,while the S/R value of Kyou-818 was lowest.There was no direct relationship among the absorption,translocation and the tolerance of rice.The clustering analysis was made according to the tolerance index of rice to Cd and the ratio of shoot to root,10 rice cultivars were classified into 4 groups.In the first group,there was avariety with high translocation and weak tolerance(Yangfujing 7,Teyou-559).In the second group,there were varieties with less translocation and weaker tolerance(Liangyoupeijiu,Suyou 22).In the third group,there were varieties with little translocation and stronger tolerance(Ⅱyou 838,K you 818,Wuyunjing-7).In the fourth group,there were varieties with more translocation and strong tolerance(Ningjing 1,Zhendao 8,86you-8).Conclusion] The research provided basis for screening the rice varieties with both low Cd content and high Cd tolerance.